package com.wkky.mechanismscreenings.utils;

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ExcelCellWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {
    // 可以根据这里的最大宽度，按自己需要进行调整,搭配单元格样式实现类中的，自动换行，效果更好
    private static final int MAX_COLUMN_WIDTH = 50;
    //外层的键是工作表的编号（Sheet No），内层的键是列索引，值是列的最大宽度。
    private  Map<Integer, Map<Integer, Integer>> CACHE = new HashMap(8);


    @Override
    protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        boolean needSetWidth = isHead || ! CollectionUtils.isEmpty(cellDataList);

       // 在需要设置列宽度的情况下，首先从缓存中获取当前工作表的列宽度数据，如果没有缓存，则创建一个空的列宽度数据。
        if(needSetWidth){
            Map<Integer,Integer> maxColumnWidthMap =(Map) CACHE.get(writeSheetHolder.getSheetNo());
            if(maxColumnWidthMap == null){
                maxColumnWidthMap = new HashMap<>(16);
                CACHE.put(writeSheetHolder.getSheetNo(),maxColumnWidthMap);
            }

            Integer columnWidth = this.dataLength(cellDataList,cell,isHead);
            if(columnWidth >= 0){
                if(columnWidth > MAX_COLUMN_WIDTH){
                    columnWidth  = MAX_COLUMN_WIDTH;
                }
                Integer maxColumnWidth = (Integer) ((Map)maxColumnWidthMap).get(cell.getColumnIndex());
                if(maxColumnWidth == null || columnWidth > maxColumnWidth ){
                    ((Map)maxColumnWidthMap).put(cell.getColumnIndex(), columnWidth);
                    writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
                }
            }
        }

        

    }

    private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
        if(isHead){
            return cell.getStringCellValue().getBytes().length;
        }else {
            WriteCellData<?> writeCellData = cellDataList.get(0);
            CellDataTypeEnum type = writeCellData.getType();
            if(type == null){
                return -1;
            }else {
                switch (type){
                    case STRING:
                        return writeCellData.getStringValue().getBytes().length;
                    case BOOLEAN:
                        return writeCellData.getBooleanValue().toString().getBytes().length;
                    case NUMBER:
                        return writeCellData.getNumberValue().toString().getBytes().length;
                    default:
                        return -1;
                }

            }
        }
    }
}
